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botanical name:
Ludwigia uruguayensis
Ludwigia uruguayensis © Deeproot Plant Base
common name:  Uruguayan Water Primrose, Uruguayan Primrose Willow
synonyms:  Ludwigia hexapetala, Ludwigia grandiflora, Jussiaea grandiflora, Jussiaea michauxiana, Jussiaea repens var. grandiflora, Jussiaea uruguayensis
family:  Onagraceae
characteristics: perennial
height: 1.00m
width: 4.00m
growth rate: very fast
growth habit: semi-prostrate
leaf colour: green
flower colour: yellow
main season: Summer
aspect: full sun, part shade
conditions: wet/waterlogged soil
preferred soil pH: any
minimum temp: -23°C
USDA zone: 6 to 9
description:
Vigorously creeping aquatic marginal, usually growing from mud or boggy soil at the water's edge but may also produce mats of floating stems and leaves. Spongy white roots often hang in the water. Leaf shape is variable, from rounded or elliptical to willow-like narrowly lanceolate, especially when flowering. They are alternately arranged but may be crowded at the end of the stems, appearing rosette-like. Bright yellow flowers with 5 or 6 petals, produced at the leaf axils. Seed capsules follow.

cultivation:
Boggy soil at the edge of water or will grow in shallow water.
May become aggressively invasive in some situations.

propagation:
By seed or rooted stem sections.

other notes:
Native to South America and possibly parts of Central and North America, where in any case it is now commonly naturalised.

Listed as potentially invasive in the UK (Wildlife and Countryside Act, Schedule 9)

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